Statistical naturalness and non-gaussianity in a finite universe

Elliot Nelson, Sarah Shandera

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Abstract

We study the behavior of n-point functions of the primordial curvature perturbations, assuming our observed Universe is only a subset of a larger space with statistically homogeneous and isotropic perturbations. If the larger space has arbitrary n-point functions in a family of local type non-Gaussian statistics, sufficiently biased smaller volumes will have statistics from a "natural" version of that family with moments that are weakly non-Gaussian and ordered, regardless of the statistics of the original field. We also describe the effect of this bias on the shape of the bispectrum.

Original languageEnglish (US)
Article number131301
JournalPhysical Review Letters
Volume110
Issue number13
DOIs
Publication statusPublished - Mar 26 2013

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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